Lamp-lens.



a Patented May 12, 191%.

2 SHEETS-sHEETL y w 2 ATTORAZL} LAMP LENS.

WITNESSES G. A-. MAGBETH.

LAMP LENS.

APPLIO'ATION FILED JAN. 29, 1912.

L096, 1 14:w Patented May 12, 1914.

2 SHEETS-SHEET 2.

IN EN OR.

2, 4. V 7 BY A ORNEK- N $ATQ GEORGE A. MACBETH. 0F PITTSBURG PE NiNSYL VANIA.

Specification of Letters Patent. t

meat at;

LiMP-LENS,

Application filed January 2&1912. Serial No. 87%.113.

tain neu. antl use't'ul improvements in La'mpt Lenses. ut' \vhit'h the fnlluu'ing is a aperitication.

The invention relates to lenses tor lamps. aiul it has for itS primary ohjet'ts the provision of a lens of the type wherein the weaker ptu'timh of the glass are strengtht'nttl. antl the provision in sueh lens having its ridges divided into \ertieal hands. oi means whereby the lens at the joining of the Lands is lighted. These together with such other ohieets as may hereinafter ap-.

pear or are intitleiital to my invention. 1 attain by means of a eunstruetion illustrated in preferred form in the aeeoinpanying drawings wherein- Figural is an elevation of a l(ll.\'tl1ll)l\tl ing in invention:

l igu're Z-is a plan view of Figure 1 shown in relation with a light tliagrnnunatieally ilttlltttl(l. antl Figures 3 anti 4- are Ret'tions on the liue lll-l II antl lV--lV of Figure l. and Figure?) is a plan View of another enihotlinunt of my invention.

(in referent-e to the drawing it will he seen that. l have illustrated a lens having a plurality of ritlges l and '2 \Yhieh extentl aeror-s the width Or the lens antl \\'hieh are tlirieletl vertieally into a plurality of lltlllt'lS 3i 3. It. ete.. the ritlges heing formed on a radius of curvature sumller than that of the lens as an entirety. (fltll ritlge eonstituting in etl'eet a lens itself. The purpose of tlivitling the ridges into Yertieal hantls is tl at the VlHHZtl etlet't is a hroatl hantl extending \(tl'it;;:1 ll on the lens, llltS hantl heing wider than litat 1 given h the lens of the ordinary type. in I order to hetter distribute the light I have provided lentieular ribs 4 located on the? inner fare of the lens .Quhstantially iarl aeent or opposite the \\'eal enetl p rtions. ll giring to the rihs a lentit'ular eonstruetion the light sueh' as are illustrated hy the rays 'nt lnu'artlly antl line (1. in Figure I. are bent nerve to lighten up the point of jltilt't'tlte ot' the. vertleal hands and also iut-reasc the breadth of iitltl of light. in each vertieal hand. l(' t(l($tl(l llt1g' strength the, stltu'lute has'an atltlitional advantage in that no matter what the angle of vision there will always he seen a hand of llglllt it will he nhrinus that in) improved form oi'lens i.-. anplieahle to a variety of types 0f hun tllltl in Figure 5 l'have illustrated v niall vessels. This lens is at substantially the name eonstruetinn as that of i igurn 1, hut has the lentieular rihs set slightly to one Ritle of the point tifivjllllCtil l'Q of tltt hver t tit'al hanth of ridges. lint order to semen 'trate m re light in the etilluhets nr ha'itlS.

Having thus tleseribet'l my invention and illustrated it use. what I elajm as new anti tlesire to Ftt'lllt h Letters Patent. is an folloiving: v

l. A t't'tl'\'ttl lens provided with a pluralit il r-tll sftnltit ll horizontal retracting ritlgea having sltt'lt ridges tliritietl vertically into sets .ttltl heing provided with strength ening nietnhers atljaeent the points of june- 'ture of the Feta.

2. A eurvetl lens pruritletl with a @lurality of substantially horizontal refraeting ridges. ha ring such ridges divided vertically into sets and heing provided with lnnticnlar strengthening nuauheix atljaeent the points tit juneture ot' the SQlZt-i.

2). A lens provided with a plurality of st-thst'antially horizontal rows of ent re ret'raetiug portions arrangml in series One :thm'e the other anti tiit'itlerl vertically inte sets. the lei having i" loe steti at'ljaeent the dividing lines of the sts.

it. lenwprmn'leti with a plurality of suhstantially horizontal rows oi eon er; re? t'raeting portiomv arranged in series one i ahoi'e the other and divided vertically into set. the lens having lentieular ribs lneatetl atljaeent the thrilling lines of the I 711 A eurretl lens prnvitletl with rilurtih t ity of 'lll)f-'ittlli"ltllly 'l'inri zoitttnlly tils Al refrat-ting portions farmed on a rarlius t t-urvaturo smaller than that of the lee and divided vertieall into SQ'S the lens heiiig 1 proritletl with llilsltttP-ittl on its inner sin-- have substantially t ppngiite the livirling lines of the vertical nets.

(3. it eurveti lens provided with a pluralit of substantially horizontally dispoaeti refrat-ting portions formed on a ltttiilifi; of eurvature iualler than that of the lens and divided rerticall t into new, the lens lining a ltllshtlttlilttl for use on marine lamps for tit) till v 

